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cpuidle: Ignore interval prediction result when timer is shorter

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This patch prevents cpuidle menu governor from using repeating interval
prediction result if the idle period predicted is longer than the one
allowed by shortest running timer.

Signed-off-by: Tuukka Tikkanen <tuukka.tikkanen@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Tuukka Tikkanen 2013-08-14 19:02:34 +03:00 committed by Rafael J. Wysocki
parent 81455e7221
commit 330647a950
1 changed files with 4 additions and 1 deletions
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5
drivers/cpuidle/governors/menu.c
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@ -238,10 +238,13 @@ static void get_typical_interval(struct menu_device *data)
*
* The typical interval is obtained when standard deviation is small
* or standard deviation is small compared to the average interval.
*
* Use this result only if there is no timer to wake us up sooner.
*/
if (((avg > stddev * 6) && (divisor * 4 >= INTERVALS * 3))
|| stddev <= 20) {
data->predicted_us = avg;
if (data->expected_us > avg)
data->predicted_us = avg;
return;
} else if ((divisor * 4) > INTERVALS * 3) {